Son, who heads Sprint’s parent company SoftBank, says merging Sprint with T-Mobile would create a stronger competitor to the big guys, Verizon Wireless and AT&T Inc.

The pitch hasn’t worked with federal regulators, so now Son’s going on TV, doing interviews, and speaking to the U.S. Chamber of Commerce. He’s promising a price war and much faster speeds if the deal goes through. Son says the U.S. economy now suffers from expensive and relatively slow mobile service.

Son also says that technological advances on the horizon will increase wireless speeds allowing a combined Sprint and T-Mobile to compete with home broadband providers, in addition to wireless providers.